Saab Automobile AB

About: Saab Automobile AB is a based out in . It is known for research contribution in the topics: Radar & Antenna (radio). The organization has 760 authors who have published 890 publications receiving 11811 citations.

Method and apparatus for level measurement with microwaves

Abstract: The invention concerns a method and an apparatus for measuring the level of a material with microwave signals. The apparatus consists of a signal processing unit (10) and a transmitter unit (1) of known type. The transmitter unit produces a measuring signal having a frequency (f m ) corresponding to the distance (H) to be measured and a reference signal having a frequency (f r ) corresponding to an accurately known length (L). In the signal processing unit (10) the reference signal is multiplied by a selectable number (AQ) which is proportional to the quotient of an assumed value for the distance divided by the known length (L), after which the frequency is divided by a fixed number (Z) so that the frequency of the signal after multiplication and division becomes equal to the expected frequency of the measuring signal. Thereafter the control signal thus produced is mixed with the measuring signal, for determination of the phase difference between them, which is sampled in each of a succession of regular sampling intervals, and the change in phase difference through the successive sampling intervals is calculated for determining a correction term for the assumed distance.

Clock signal distribution and synchronisation in a digital system

Abstract: The invention relates to a method and a device for increasing the working speed of synchronous digital systems comprising a number of system parts (A - D) placed at a distance from each other and communicating with at least one other of the other system parts. A common signal for the system with a reference frequency (2) is distributed to all the system parts. The system parts are each equipped with their own internal clock signal oscillator (5) which is phase-adjusted individually for the different system parts in relation to the signal received from the reference frequency (2) so that the communication between the communicating system parts takes place with the same phase relationship but can take place in different periods.

Arrangement in a fuel system in a vehicle

Abstract: In a fuel system of a vehicle a filler end of a fuel pipe is attached to the bodywork of the vehicle and accessible via filler opening in the side of the bodywork. The filler end is fastened to a bodywork element situated inside the side of the bodywork, which bodywork element supports a shield arranged around the filler end, which shield finishes at a certain distance from the side of the bodywork and during collisions protects a filler cap mounted on the fuel pipe.

Power efficiency circuit

Abstract: A radar level gauge for measuring a level of a surface of a product in a tank having a two-wire process control loop, output circuitry coupled to the two-wire process control loop for setting in the loop a desired value of a loop current (I loop ) corresponding to the product level, a power supply circuitry coupled to the two-wire process control loop for receiving power from the loop and being a source of power for a microwave source, a microwave receiver, a measurement circuitry and the output circuitry and including a converter for transferring power from the loop to said power supply circuitry by means of feeding a first current (I DC/DC ) from the loop to the power supply circuitry, a current generator included in said output circuitry for generating in parallel to said first current a second current (I sh ) in the loop for maintaining said loop current at a value corresponding to said product level and a sensing circuit for determining the value of said second current and having an output indicative of the value of said second current.